Supplemental Cash Flows Information (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Cash payments (receipts):
Interest, net of amounts capitalized	$ 408	$ 369
Income taxes, net	(87)
Common Stock
Non-cash financing and investing activities:
Dividends declared but not paid	252	241
Preferred and preference stock
Non-cash financing and investing activities:
Dividends declared but not paid		12
SCE
Cash payments (receipts):
Interest, net of amounts capitalized	345	312
Income taxes, net	(87)
Non-cash financing and investing activities:
Accrued capital expenditures	478	450
SCE | Common Stock
Non-cash financing and investing activities:
Dividends declared but not paid	$ 0	0
SCE | Preferred and preference stock
Non-cash financing and investing activities:
Dividends declared but not paid		$ 12